Evaluation of a Low-cost Renal Simulator for the Diagnostic Ultrasound Training of Veterinary Medicine Students.

The acquisition of ultrasound diagnostic skills via training is important for undergraduate veterinary medical students. Unfortunately, commercial simulators are costly, which limits their use and makes it necessary to develop low-cost simulators for training purposes. The aim of this study was to evaluate the efficacy of an easily constructed, low-cost, high-fidelity renal simulator for use in diagnostic ultrasound training of veterinary medical students. To construct the simulators, donated cat kidneys were embedded in a prepared agar matrix. The echogenicity of ultrasound scans obtained on the kidney simulator was assessed by the subject lecturers and compared with images acquired during clinical routine diagnostic procedures. Five students with no prior experience of the technique, under the direct supervision of a lecturer, performed five B-mode ultrasound examinations of the renal structure of the simulator. The structure of the kidney was assessed, and its length, width and thickness were measured. Three lecturers performed the same procedure as the students, and their results were used for comparison. Appropriate anatomical and ultrasonographic realism was achieved for each of the three layers of the kidney (cortex, medulla and pelvis), and similar pixel values were obtained with the simulator model and actual clinical diagnostic ultrasounds. In addition, the kidney dimensions acquired by the students were consistent with those acquired by the lecturers. Thus, the proposed kidney simulator can be used for the training of veterinary medicine students in ultrasonographic diagnostic techniques.

Surgical Extraction of Viable Hen ( Gallus gallus domesticus) Follicles for In Vitro Fertilization.

Assisted reproduction techniques in birds have been developed for zootechnical purposes and have been adapted for use in conservation of wild bird species. To develop a technique for obtaining follicles in live hens, 5 Rhode Island red hens ( Gallus gallus domesticus) were anesthetized, and abdominal ultrasound was performed to confirm the presence of ovarian follicles. A left celiotomy then was performed to obtain follicles in different stages of maturation for in vitro fertilization. The follicles were located by digital exploration, then extracted by isolating each follicle with the index finger of each hand, holding it by the stigma, and then applying slight traction towards the exterior of the coelomic cavity until the follicle separated from the ovary. In total, 18 of 30 (60%) follicles obtained were suitable for in vitro fertilization, but only 3 (16%) were fertilized successfully. All birds recovered from the procedure and remained in good condition postoperatively. Perfecting assisted reproduction technique holds potential benefits for determining sex of embryos by blastomeres sexing, supporting the conservation efforts of avian species, and benefiting research areas, such as genetic and biopharmaceutical research.

Morphometric differences in testicular tissue of tadarida brasiliensis bats from the urban area of Mexico City during summer, autumn, and winter / Diferencias morfométricas en parenquima testicular de murcielagos tadarida brasiliensis del área urbana de la Ciudad de México en verano, otoño e invierno

Most of the neotropical bats reproduce in a seasonal fashion. The purpose of this study was to assess changes in testicular tissue by morphometry, in Tadarida brasiliensis bat, in a south urban zone of Mexico City during summer, autumn, and winter. Three sample collections (February, June, and September) from T. brasiliensis were carried out (n=6). Testicle fragments were obtained for histological studies. Diameter of the seminiferous tubules and interstitial space were measured, cellular populations were identified and counted. June samples showed smaller diameter of seminiferous tubules and larger interstitial space between tubules; also there were less number of germinal epithelium cells and spermatids were absent. Tissues from September and February showed a significant increase (p 0.05) in tubule diameter, germinal epithelium thickness, and number of germinal epithelium cells when compared to June samples. Only February samples showed presence of spermatids. Our results suggest the existence of seasonal variations in the reproductive activity of T. brasiliensis, under conditions in which the study was conducted.

La mayoría de los murciélagos neotropicales se reproducen de manera estacional. El objetivo de este estudio fue determinar los cambios morfométricos en el parénquima testicular del murciélago Tadarida brasiliensis que habita en un área urbana del sur de la Ciudad de México durante las estaciones de verano, otoño e invierno. Se obtuvieron fragmentos de tejido testicular para su estudio histológico. Se midió el diámetro de los túbulos seminíferos y el espacio interstisial y se identificaron y contaron distintos tipos celulares. En las muestras de junio se encontró un menor diámetro de los túbulos seminíferos y un mayor espacio intersticial entre los túbulos; también hubo un menor número de células del epitelio germinal y no hubo presencia de espermátides. En las muestras de tejido obtenidas en el mes de septiembre y febrero se observó un incremento significativo en el diámetro del túbulo, grosor del epitelio germinal y número de células del epitelio germinal cuando fueron comparadas con las muestras de junio (p 0.05). Solo en las muestras de febrero hubo presencia de espermátides. En conjunto, nuestros resultados sugieren la existencia de variaciones estacionales en la actividad reproductiva de T. brasiliensis, bajo las condiciones en que se realizó el estudio.

Validation of the educational potential of a simulator to develop abilities and skills for the creation and maintenance of an intravenous cannula.

Historically, the method used in veterinary medicine to teach technical procedures which are to be performed on live animals, has taken the form of an apprenticeship. However, in the last decade, there have been several new developments in technologies oriented toward the development of such abilities and skills by students - for example, manuals, videos, pictures, and virtual reality simulators. Unfortunately, these simulators are inaccessible to many, due to their high cost. For this reason, it is necessary to create simulators that are easy to manufacture at low cost, and that are also portable. These simulators also need to be validated with regard to their ability to fulfil the required educational objectives. The validation of a venous simulator is described in this study. Fifty-two veterinary students, with no previous experience in the creation and maintenance of an indwelling venous cannula, were selected at random. They were divided into two groups: one experimental group (n = 35), who had training practice on the simulator, and the remainder (n = 17), who acted as the control group (i.e. they had no training practice on the simulator). The outcome measure was the number of attempts required to successfully cannulate the cephalic vein of an anaesthetised rabbit. The students in the experimental group showed more skill in cannulating the vein, with 45% effectiveness, as compared to 20% effectiveness in the control group. The difference between the groups was statistically significant (p < 0.05).